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<p class="MsoNormal"><span style="font-size:14.0pt">Good afternoon all!<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:16.0pt">Please join us for Abraham Tekoe’s MS Defense on Tuesday, March 10<sup>th</sup> from 3-5 PM in EOA 1044.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:14.0pt;color:black">Title:</span></b><span style="font-size:14.0pt;color:black"> Efficiency of Tropical Cyclogenesis in Large-Scale Circulations: Climatology of Monsoon Gyres and Tropical Cyclogenesis in the Western
North Pacific<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt">Name: Abraham Tekoe<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt">Date: March 10<sup>th</sup> 3:00-5:00 PM<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt">Major Professor: Chelsea Nam<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt">Location: EOA 1044<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:14.0pt;color:black">Abstract: </span>
</b><span style="font-size:14.0pt;color:black">Monsoon gyres (MGs) are large-scale cyclonic circulation systems embedded within the western North Pacific monsoon trough and are often associated with tropical cyclone (TC) formation. Despite their importance
as precursors to tropical cyclogenesis, the factors controlling the timing of TC formation within MG environments remain poorly understood. This study examines how the structure and horizontal scale of MGs influence the evolution of embedded disturbances and
the timing of TC genesis during 1980–2024. An objective detection algorithm was developed using ERA5 reanalysis data to identify MG events, and each gyre was analyzed using a normalized coordinate framework to compare environments across gyres of different
sizes. Convective activity was diagnosed using GridSat-B1 infrared satellite data, while TC formation was identified using IBTrACS best-track records. Results show that MGs are strongly linked to TC formation, with about 91% of detected gyres producing at
least one tropical cyclone. However, the timing of genesis varies systematically with gyre size: larger gyres tend to produce TCs later than smaller ones. Thermodynamic conditions such as sea surface temperature and humidity are generally favorable across
cases, suggesting that dynamical processes—particularly vortex consolidation and vertical alignment—play a more important role in determining when genesis occurs. A detailed case study of Invest 95W (Typhoon Tapah 2019) illustrates how TC formation can be
delayed within very large MG environments. Overall, the results support a two-scale framework in which monsoon gyres provide a favorable background environment, while the timing of tropical cyclogenesis depends primarily on the dynamical evolution of embedded
vortices.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt">Best, <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt">Adea<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Segoe Script"">Adea Arrison<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Segoe Script"">Sr. Academic Program Specialist<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Segoe Script"">Department of Earth, Ocean & Atmospheric Science<o:p></o:p></span></p>
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